Future -> 代表的是未来的一个凭据
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public interface Future<T> { T get() throws InterruptedException;} |
AsynFuture -> Future具体实现类
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public class AsynFuture<T> implements Future<T> { private volatile boolean done = false; private T result; public void done(T result){ synchronized (this){ this.result = result; this.done = true; this.notifyAll(); } } /** * 轮询 没有完成等待 */ @Override public T get() throws InterruptedException { synchronized (this) { while (!done) { this.wait(); } } return result; }} |
FutureService -> 桥接Future和FutureTask
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public class FutureService { /** * 需进程等待 */ public <T> Future<T> submit(final FutureTask<T> task) { AsynFuture<T> asynFuture = new AsynFuture<>(); new Thread(() -> { T result = task.call(); asynFuture.done(result); }).start(); return asynFuture; } /** * 运行完 自动回调 * 无需进程等待 */ public <T> Future<T> submit(final FutureTask<T> task, final Consumer<T> consumer) { AsynFuture<T> asynFuture = new AsynFuture<>(); new Thread(() -> { T result = task.call(); asynFuture.done(result); consumer.accept(result); }).start(); return asynFuture; }} |
FutureTask -> 将你的调用逻辑进行了隔离
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public interface FutureTask<T> { T call();} |
需要时回调：
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/** * Future -> 代表的是未来的一个凭据 * FutureTask -> 将你的调用逻辑进行了隔离 * FutureService -> 桥接Future和FutureTask */public class SyncInvoker { public static void main(String[] args) throws InterruptedException { FutureService futureService = new FutureService(); Future<String> future = futureService.submit(() -> { try { Thread.sleep(10001); } catch (InterruptedException e) { e.printStackTrace(); } return "FINISH"; }); System.out.println("=============="); System.out.println("do other thing."); Thread.sleep(1000); System.out.println("=============="); /** * 调用也形成了阻塞 */ System.out.println(future.get()); }} |
运行：
==============
do other thing.
==============
FINISH
运行完自动回调:
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//** * Future -> 代表的是未来的一个凭据 * FutureTask -> 将你的调用逻辑进行了隔离 * FutureService -> 桥接Future和FutureTask */public class SyncInvoker { public static void main(String[] args) throws InterruptedException { FutureService futureService = new FutureService(); futureService.submit(() -> { try { Thread.sleep(10001); } catch (InterruptedException e) { e.printStackTrace(); } return "FINISH"; },System.out::println); System.out.println("=============="); System.out.println("do other thing."); Thread.sleep(1000); System.out.println("=============="); }} |
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原文链接：https://juejin.cn/post/7022215197204938783
